Another mc?

Help!! I'd be really grateful for some advice for you please. I've struggled to conceive, been referred through nhs to gynaecology to find after tests that nothing has come up and my partners sperm count is also normal- yay! However as I'm 39 the consultant has decided there is no time for further tests and referred me for IVF. I've been desperately trying to get pregnant before the letter comes through as the idea terrifies me and we wanted to do this naturally. My period is now 2/3 days late (I'm like clockwork) and its come back negative. Ive felt like utter death the last week or so and taken this as a really positive sign. Is this another very early mc or has this happened to others? I bought the most expensive test as I thought it'd be the most accurate....